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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ebeb28f90072009df88638baaa4a27a581471489c30b3ebab0d778772025118' 
  AND token = 'NxnAJ+U8z/nypdxnlhswhHeTMFmBxgHq1O0gkrJhh/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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