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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dae40e944249f5ae7260adf136c87fd2950cbd62c38bbb2409c57200b74f592b' 
  AND token = 'Ib19dJyaQrzpTDzOiRBjSfXk6CoCa2dbFGl8oDt2bmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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