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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e3ada38282f6dec281d04b8cc6de4cb0dbe6e62a7f82007ea442a8f0b4c6c68' 
  AND token = '6MIOt6NvKW0C0LQfp/J3qkCV6FKj1QMUYPfGBpU+EA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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