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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60ea5f355c9bad46abecbf2b5a05a0ac8b328cdcd1566d209144a04802ade485' 
  AND token = '6v0ot5xj44SPAOZ1rgKjUMJYadUyP1QI6DcxBRf1X3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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