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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4145eb7acf6c6329fa9cded0fd33924d0c3f9aecef7f4f44025a79d7314c25eb' 
  AND token = 'eNVjCTsqhYVW4AAZP8tag5ru16Xq7EwKxk5aNxNlW8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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