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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3437af30b5b9b3db3ab60c5b91f47976b2a5b102cf5ee678bdc888b51873062' 
  AND token = 'gD35l7/3tm3fX4pwLPKn7temRIs6jhU8IgBIITiOsTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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