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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9823464500de17f07f2e8b47e7da20f59a2fb7d10d3023d62ba8fd6bc7d1f982' 
  AND token = 'K4JLB55Q9yML4Wp5zkF1JebaIEFmsf6jqTVvZKYBE1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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