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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'c86d851c8224e2caa1460998c74b4fb296e9d3d9a5daf6499fb8e0c279cb91c5' 
  AND token = 'z99MqYKFM8wUPegVCBcUcNz0TABpzGcoXTahQGSByQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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