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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'b1b8543c87e3414b5c05d2061686bbec608ddc799e9d209dbb4dda02969a5a8e' 
  AND token = '5BOJk0EtUFGRTo5Jh5TLls9FBQyEDb6A0A4+5ugPxUo=' 
  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"
    }
  }
}