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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c41c7c9f1b755e7b90102ef1230d1a51e75e4c692015227ccea16615eec42f64' 
  AND token = 'IgFkB8l4hle/RcVe6S7bPGJuimHqM0AWakH2xFdUwAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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