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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '4f2c58ca066ba7cb8cdd9e66b28e99fb40c698425018c229e809723b41619c20' 
  AND token = 'N7mUFRoNaG76vd6iodr+VuYsChPtzGEPnt18MS9K7ho=' 
  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"
    }
  }
}