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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c39ab8326856b74c309154944b5c45e25def9c605f982b790368904856565ea' 
  AND token = '9qcE0iPqUlD3qOk8fxZA95hMsTmN/itz8QdcvM7I02Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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