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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '204fa2d0aa1d14b209156c1ec336946293ab418f60c21c26dd56ca3bf2d583fc' 
  AND token = '/d5y3saOjn4wIDX6ecSw5A1D7Ybcea90VYR/Q/p4FXs=' 
  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"
    }
  }
}