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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dc227bae99a53e61574e1dc595b4d3d2f128a7ce5d3b29242bef7b5b85c61af' 
  AND token = 'vvms2J+q5xhLDk8bOQQKatnAD5X2ds64mW20cR95Ojs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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