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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '6da5b6e52318b575076781e229a4b2ff90e3930098b72dce13d8aa810931307a' 
  AND token = 'LSMXRvYASVq1ed98phGVOvkrdvOpAksYkPoDM62DOQI=' 
  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"
    }
  }
}