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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd82df7d7cf9055d99c379a9272d1a0f3c4f9bbff565f366db3d97473dc214ca5' 
  AND token = 'i23E2c07CExAHJy4Ox2kPtx7RoX3lh8GYItkFUiP2yw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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