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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b16188969ec49ec2853c89ae8ec35f52ff1ce9ddd0cd607c0bcccbe31f7cb664' 
  AND token = 'ODAnWluX5GWJu43d5BkZBVzLufkl9a3A5A548Qc7rik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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