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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'c6da51432bb8b82259c44491e5eff42800095c8ffb009290792b876fc5ca7c82' 
  AND token = 'Ec0qYH0K3wHDpZ9a19rVMXGbiqUBg56ltDYNVTJr8SE=' 
  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"
    }
  }
}