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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9570d740d2ccb8ae4e60e65e1c18fba84b34cc4890a547b675046ae6fa8b710' 
  AND token = '72fWA9mTLRRrSwWHwshCEGsalyCzPtJil0nRk5AeBt4=' 
  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"
    }
  }
}