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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbf9317d78e423fd3ed498115437baeb80d16fe22a8686d168e644c051c3f833' 
  AND token = 'bKh6V1Cn0Mvgz4rzNOLe4R/YgnG21/WX7CNapDhCVjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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