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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1a083087fb4b5c8f9913a770ead10e89f484ab281d52758da08c7348d55d29f' 
  AND token = 'CeqPxLxEt7XEyqUX7S4eMw0WkrM9WMjUan+GqaET9e4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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