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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '549a113107bf16bcd254d596558835bbcdf3a6d5039095629766243df781d328' 
  AND token = 'djx8nM7o8PemA4t8F1jt0mWrmmORAe7jN8FeTwMoSFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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