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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8502c30384839f5c49cfc947ed0e9a1cbb6f42654af091b8a94ae939b7e0d3c3' 
  AND token = 'qpi34nVFatDhZG8K1ARrK4xz1Z5sFc0csIj/Upln460=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00099

JSON explain

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