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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'c5f5b2beef0a0fe8788011ac1160c8f6796476f3cb305e9960d09e2e95c00a0a' 
  AND token = 'wUbdD/zs806ZXarTpRrK1TjG8OfRf2xaKGO6+ZcyjEA=' 
  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"
    }
  }
}