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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb8669c59a210aec8dcb622c806b09e80b72cd87269d7b23575c103bae92f1ae' 
  AND token = 'YGHvrmF7E/0OJ6HcI2nIT9IyMHl8cRewq2y9sqg2dSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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