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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e7023d3b1c74f23e1eb614b1a5ad2356b46ab68372d4a1ce8bf21ce73670671' 
  AND token = 'Xz+pvN/a8trPN5a08Z0rFDDmqmjsWactrKI82/H4oXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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