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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28f89e41bfa27866cfdb8cbc0aaf3f970a7f01e5f9555fb2d04a3096d5baf50a' 
  AND token = 'OFOxT/51QH2TlIF6xBQKjOt9Zn7BdT9f+OWiGqx96Ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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