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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fecf13ed1f3a2dea53d2d8e0487af5fbce58c961acb38c9bb8e576575ca24ac' 
  AND token = 'aZ2ekbSeypL3yPWNddGgssfGyM0T8we9Uauc/MiCwjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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