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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '9e873017a09979a4982a41982e6914d78b2d8d631eb6516fae724c4e19646ac4' 
  AND token = 'e7aHMR3+HeL/SJDBsoSfPjIRywrEilx/x3rd05amgGQ=' 
  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"
    }
  }
}