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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'bfaa3736fbbc680e9bb0215f9d8a799ea5b4d972c4bfb136424dc54b8c1f6a2f' 
  AND token = '5fO5tIyY7163sVwlOo5vODGKPCvxlUxJ2dGl7vnLcsQ=' 
  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"
    }
  }
}