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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '42d47f5bbca535344226da06bb5a000b1407be78d3c522c0f5e3dc7a8d6c48fb' 
  AND token = 'd6dph3ofUJ5IawVZoQ5nyXpkIDb5MZ4+shlVUTfqkec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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