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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac90058042803347aba1257b6c4ea4bce372995f885014a9d3b4929e8e3691dd' 
  AND token = 'WxAzUdFj1gZA4pmt/JzI8GsQp9qgwO0xzsERx0aCNhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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