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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bb85e18b3f75756e26c37e51204a0068fbdaf74204af7ba9e3ee6f95a60babc' 
  AND token = 'XZ4gnSNTfkIUqpqtfPCvN3t+tXkO4lYiqrSiguWi9rI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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