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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08570f77d52aa50dd778e7ce7ce023ef9970815d69b3c5be2a290751469d26f9' 
  AND token = 'vXLjFdfzIAo0HQd8v5zJNF442Cy9xEp/sJCCQsN77G0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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