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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d410def7d5a1f6c2ac40a42521868a7368e099149a2ec4de92ea920fbc937a5' 
  AND token = 'srIKzIR/4fPROam25OCqBwII4cU+DKKiDktQ8R+KuGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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