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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '854b3941437cb72e3766961fd65948a75eb6c3cdfbaba37aff9fa5e972b0fb3c' 
  AND token = 'WCvCZ4/AjbxnSbcJNOCWgPlc9ddstOg8cXXgjK6E1RM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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