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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'b1d20969899ff3f31f454e0e4a9f1f9fc8ece275fb924e7fb5ee9c01e2450410' 
  AND token = 'YijXy79CyFwIdXu+MYqU2eKtxq7rxdZ3+3bZY9wZJkE=' 
  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"
    }
  }
}