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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '9c78d630c32b8d39e9db119f6e1f7ea77d24841650f1ce0b29c0745e7169026a' 
  AND token = '02Syv2RLc584BnMlebfMP7SqNsFFCkulLqTfrxbh+3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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