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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e069908d5b87f3ab107226b4aaaede9d0cbb0087920db019b91d8885a1902ff4' 
  AND token = 'KvDk9FTFSwoo1nUjEYEkJji44i419DD600cTyXn3GXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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