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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '4884860edd3e5967a2a79a35ad6df84b61b71cb82eac559318341d4e5040c65c' 
  AND token = 'hCxct20BEvMNmxaAvauqwoy0QNQoTVD3TByA4cDfbro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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