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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '4a75ac08fb6b4e0e88624dd1ff2f9194fa35aa6cfa76457375f717d8bc34dbd8' 
  AND token = 'RANx+i8eQtu6vjaIrq7qEimHbgVO7+9lvblw2xuGbwI=' 
  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"
    }
  }
}