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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0aab523ce56c0c6f4e6c0ea36d5caf96b6980fec932d817c9a4e9f7c7e0d282' 
  AND token = 'zkA7Z5poox13o9a5BcF0SrSMIheLyLSFjg8saV4aiII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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