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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb169f4ce4cc79d0f45a37325a05b0c5fb25e7f11711ceae7560d9cc2dc6cf94' 
  AND token = 'SpcQ3CJpas43XcDbUjviJJ4WYAmVURDGSyMiphRT794=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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