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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0e12af720ebb3138ef78fc60aacb3ce46c12586d4ae6e6871d4e78b9ef5a90c' 
  AND token = 'lCh+765ArMDzp5OjoVOcc8cGOLpgMWIm0OsijdkBdtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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