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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd4d37f703b71e87f21597f191483ca4fe204db9d55b33d3a9a75d4774193a04' 
  AND token = 'AzXr332uyMw9T95y4dxtjOru7UY3IE8P2aUgsTAHXNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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