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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec20c8014de665fadd23707a74d419fbc4b1dc64c90bc011fb38e9be8ba26c03' 
  AND token = 'ZJhaV780e2ZEl3P3rTagHLpW3V37X4p+fWUrptC9bXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}