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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fad18625039216bb02fc3e4cb5f17d3d527e8755f871906c1bf95392ccdd88df' 
  AND token = '0oIJyOkyiyfqdNcu4x/KDN/U/oG7vA7mmrGB5XOFfL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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