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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'f2b0467ca69a832e38f9f817eb5e09d65a64c7500c0caa38d3e24898b38750be' 
  AND token = 'erm77faUxvXaXRylji+R1txtjufSYsARLA52EeYX318=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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