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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ee958885c084b7c1f2b5a652903a6d3a0b344fbb4cf64ee334a9d8a7032153a' 
  AND token = 'wV7jdr4ahtSia4T+osOEd5y9vOqYW1ZtwCrFynIJ8LY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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