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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b91b685fb6e2fa10d7e83418241d3a763ec2bfb4e5177f445bb30a575d6bd381' 
  AND token = 'LTPRke/SH6Lc658UKkSDoCDc68GWMjU+AVmek19sm7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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