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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05691689867a3ba6cec1eb3bdd56e2a84c1a1007745852bf820ec79c9c96a061' 
  AND token = 'KI5OWKKH+sIczQd78jG9gjvYU3QSLAGEG5OfL1CiLks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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