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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'f1408091833e9c28c8d92dcee3d4eb0beb695120dd0faa43ad14b8d1b9ad2f09' 
  AND token = 'vvG/Eu3r+xvO1R1P1WRPu01KSOrcWU7nYkzwP2HO43Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}