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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '52c1a1e7ea9daafbd8ddb8a8fac2f7b442304589a2a5716f06caf32b15aa0d0e' 
  AND token = '2hKlpkwa8RX6X79WpWQhbzY0T25dkbWOt1y0vbn0AsI=' 
  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"
    }
  }
}