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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '796933c3482450cb5e03259ca3a3e3aab90ea8e359384ba4efdbca99324a51d8' 
  AND token = 'pgD7twi0f2r5vqXUnrEpbuFbZKsaMyaakS9YssGXenU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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