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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '998458258d4e5bcec4cab1700c80f33bc10083e23e9d829fb4a7ca55e1276fdf' 
  AND token = 'Q15eWXQO7wNGy6hNpN7nSFS4e4hubSnibdLW5Cnxro0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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