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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97f9e3c511fc8cc2a89902c09a1f465c21e1d26b1cfc055c06d8dd9bdb8e896d' 
  AND token = 'SOffYG/gmAL7lQ0czvY4/qG9B1DI8QXsiSTJcKzNENI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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