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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'df84bfd2c10977edc21173df5383210c00a86d5e6df7e523c45722e1b07a5cc0' 
  AND token = 'ka+mY2yahYzxbgtcBIp+5fJoS5f3Y0h3bvgj/PmRv40=' 
  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"
    }
  }
}