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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'b721f5bc145636c525118d73d1f92359935e1666e5ab6f804410b0a8a06f602c' 
  AND token = 'p1tW/V3/gtOV1Qlk3hrEqJfI5szM1v5IUb9276gaNak=' 
  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"
    }
  }
}