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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82f35f32f2cebad7fd2c2fef6a937309e00a8db6f0babe2cc4cef7ff5f9bbdf1' 
  AND token = '7XtmBy4H/gcjxexQunrgWVXX1hgpftpif4WVlTdZdJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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