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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '20b6c90be24e7e6cf900d198d1f54a2d7eae46dac5b61dea9c831c1910364817' 
  AND token = 'qUhkciTitnXfyByLX1/KfGBbVRf1c1UreA0H6q/fvLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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