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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'fd6b79cb5540f39642804b5ccc42c7874d879a7fed7782a57adc697e75400573' 
  AND token = 'O6+yDz5OY70EEGwxd5Z/OHMLwxG6X4NpPrM8lvHhvB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00007

JSON explain

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