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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a3b9bf0b4e6befb6fde92856d4d00d33f132c6705d30372723dfe4dbda349cd' 
  AND token = 'hBfh0LJ0cjF83WAcvbOFdM5dGnu92s5gWEl+m6TnuUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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