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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '617911680fc7db54ca48b769b360ab0ef6f2115dfd39bab4cebbd62877153201' 
  AND token = '3dDUpDq5T8tjWWdNn0iugTAzy8EG07l72pM8l+ZehrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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