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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30dd057342ffe899d93a4e9109613006a4d0b586a3b13056514ab5ecc7aae74c' 
  AND token = 'v6a3QOPnvDk/Ar6m+Iv7w4YbEs/bXYlD41K/yrGRIBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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