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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '434f59a6b5ce06955dcef7ddeff7bff88dfee5e351665388a4deb481444e5f3e' 
  AND token = '4j56Trj1dyb4sfHBrGmFGTzQGGDyQB/V0mV1qGG040I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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