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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '474c76655ab2514763a1b64a8249bb5367bfaa0930b08d1d0c7a55c37bd0086f' 
  AND token = '1vmuFt58vR5r8kjSJXP1UvY3JA7xODp7UmtHwrxeXIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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