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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a70a32afc2c786b7a1a73905bdb0a593ab95a15e7654f80e2ec86c0cf126ae0' 
  AND token = '0L4DCFjqG74otGp4T0eh9hYtxPoZmuXk/LscCKkImVc=' 
  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"
    }
  }
}