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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '275ffabd017e3ff54e08d3d189bb8152079abab6fe871591374d5bd102967c5d' 
  AND token = 'q6eik41oVEZgF3EXVm2MoMa3XL74QV1iW/g8bioqmoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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