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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'b50c5ee567470da703ad94cf50d2b78cfcd126b29d90139bbb0eb6f8f86cda01' 
  AND token = 'ead/6joiDwPwT7WCWLBBT0ozUQDgmE3S1DueSHTroDQ=' 
  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"
    }
  }
}