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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'b1d51ecf5c82eed6ab9ffe6c6bb5c5e61ea0f3024a36d26eff5d332e1740ea10' 
  AND token = '9QYPkiLBn0K8ZodlPcUwWC48PrkUEqhhfQMcRofJV8U=' 
  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"
    }
  }
}