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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce993fc45394088d140bce7bf3f6a8953f3851bd99687e7a8d409dda87e86472' 
  AND token = 'EhdOuBx7pFd9l+Ag40Z/lGAalbl//9W8kpFiKkDnhb4=' 
  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"
    }
  }
}