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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '662e04aec6ee619a23bc6ba3bacb75f4020f3d2542c646a50f7fb56703acd2a4' 
  AND token = 'KjJZnURhNZ8GUe6fKGTp/lEnh3xsdf/Se6SLAkONtgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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