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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '66ee19366b9f0f79e2a42fe61344f04bf32cf8c4cba47cebc0c6d82bef2a8dc6' 
  AND token = 'DBb3PKLc3YpGx6XNkrOsh70LDZYGsmufBkYi7LtYJ3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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