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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '8a542360fe0c12492807ec91760a3e6f2f722d5bdd84143d73b1bbd2f760c74d' 
  AND token = '4r5pg2+PO7dVSpBP9Wrr5Dyyr3rq/qDoroIELx+KXKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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