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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d28a5150304c26be721d45c10e70ff091d4bd797927f397210b437ea7393592' 
  AND token = 'mLHCyFpM31VWQT9z7e4pwC41Sw52wT9YqURHe8Vkk/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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