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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38d021a9005632486451e01de1bf52ff6e7c9ee4685873dd26779842686ed2ce' 
  AND token = '+zzSvKFrs8/ACm4Wv32Eu+U4/pNoiee2X4F9VFWfsBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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