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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8087b7a0bb6e846603a92d621b4baf90e33694ff4f77456c6edae5fff8e1ca70' 
  AND token = '/0hSlUl42Xc5Xhu60AoZEy13WOtj8sqK9HdbUi8CBCw=' 
  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"
    }
  }
}