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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd911536e6ce20bb355d4747c2c7af2f665524fccd42d5dc6d7ad85f72b88c75' 
  AND token = '6/5Fl4JMZGlsViruY4dKR/HL1MJ5P45CrSABq9i62bg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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